Word completion seems to have problem

Word completion seems to have problem:

In this line:

wordTom,wordDick, wordD

When I try to complete 'wordD' with <c-p> or <c-n> I get:

"Keyword completion: pattern not found"

But, when I put instead this in the file (i.e., move 'wordD' to the next line):

wordTom,wordDick

wordD

'wordD' completes successfully.

':set complete' gets:

complete=i

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